HP 33s - Manual (Page 18)

1–2 Getting Started
Highlights of the Keyboard and Display
Shifted Keys
Each key has three functions: one printed on its face, a left–shifted function
(Green), and a right–shifted function (Purple). The shifted function names are
printed in green and purple above each key. Press the appropriate shift key (
{
or | ) before pressing the key for the desired function. For example, to turn the
calculator off, press and release the | shift key, then press ‡ .